Function nom::number::complete::float

pub fn float<T, E: ParseError<T>>(input: T) -> IResult<T, f32, E> where
    T: AsBytes + InputLength + Slice<RangeFrom<usize>>, 

Recognizes floating point number in a byte string and returns a f32

complete version: can parse until the end of input

this function uses the lexical-core crate for float parsing by default, you can deactivate it by removing the "lexical" feature

use nom::number::complete::float;

let parser = |s| {
  float(s)
};

assert_eq!(parser("1.1"), Ok(("", 1.1)));
assert_eq!(parser("123E-02"), Ok(("", 1.23)));
assert_eq!(parser("123K-01"), Ok(("K-01", 123.0)));
assert_eq!(parser("abc"), Err(Err::Error(("abc", ErrorKind::Float))));